Standard boilling points of the liquid is slightly

Options

A. Lower than the normal boiling point
B. Higher than the normal boilling point
C. Same as the normal boiling point
D. May lower or higher than the normal boiling point

Answer

To solve the question regarding the relationship between the standard boiling point and the normal boiling point of a liquid, we can follow these steps:

### Step 1: Understand the Definitions
- **Normal Boiling Point**: This is defined as the boiling point of a liquid at one atmosphere of pressure (101.3 kPa).
- **Standard Boiling Point**: This is defined as the boiling point of a liquid at one bar of pressure (100 kPa).

### Step 2: Compare the Pressures
- One bar (100 kPa) is slightly less than one atmosphere (101.3 kPa).

### Step 3: Analyze the Effect of Pressure on Boiling Point
- The boiling point of a liquid is the temperature at which its vapor pressure equals the external pressure.
- Since the standard boiling point is measured at a lower pressure (one bar) compared to the normal boiling point (one atmosphere), the boiling point will be lower at the lower pressure.

### Step 4: Conclusion
- Therefore, the standard boiling point of a liquid is slightly lower than the normal boiling point.

### Final Answer
- The standard boiling point of a liquid is slightly lower than the normal boiling point.